Dockside Extortionist , Xorn , Academy Manufactor , Goldspan Dragon , and Smothering Tithe are all great for this
Against creature decks, I can add a good range of removal
Brion Stoutarm offers a repeatable damage-dealing ability by sacrificing creatures, making him a strong choice for Boros players who want to close out games without needing to attack
So if you made infinite mana you can draw your library with this, but it's pretty pricey as a five mana tap outside of that deck so it's back here halfway through my card list between an Eldrazi Titan and a powerhouse equipment
If this is the third time this ability has resolved this turn, you may add
However, I pull these constantly from collections, and the buylist outs are only ranging between 20 and 35 cents